diff --git a/include/pocketpy/linalg.h b/include/pocketpy/linalg.h
index 6879466b..7b400fca 100644
--- a/include/pocketpy/linalg.h
+++ b/include/pocketpy/linalg.h
@@ -4,7 +4,7 @@
 
 namespace pkpy{
 
-inline bool isclose(float a, float b){ return std::fabs(a - b) < 1e-5; }
+inline bool isclose(float a, float b){ return std::fabs(a - b) < 1e-4; }
 
 struct Vec2{
     PY_CLASS(Vec2, linalg, vec2)